Lake Osakis 1 is a gravity dam located in Todd County, Minnesota, built in 1938. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 8 ft8 ft tall and 24 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Lake Osakis 1
The primary purpose of Lake Osakis 1 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Mndnr-ewr (state). It impounds the Long River near Clotho.
The dam stands 8 feet tall and stretches 24 feet across, creates a reservoir covering 6,637 acres, has a storage capacity of 8,849 acre-feet, and collects water from a drainage area of 425 square miles. Completed in 1938, the structure is well-established, with more than 75 years of service.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/08/2012. That was over 14 years ago.
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Location
| State | Minnesota |
| County | Todd |
| Nearest City | Clotho |
| River/Stream | Long River |
| Coordinates | 45.96607, -95.07898 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 4 ft |
| Dam Length | 24 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 8,849 acre-ft |
| Normal Storage | 8,849 acre-ft |
| Surface Area | 6,637 acres |
| Drainage Area | 425 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Mndnr-ewr |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/08/2012 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN01337 |
| Federal ID | MN01337 |
| More Info | State Dam Safety Program |